How is ABV Fraction to UK Proof calculated?

Both scales are normalized through ABV percent, then converted using a fixed ratio.

Is the mirror direction available?

Yes. Use the switch button or open the UK Proof to ABV Fraction page.

Can I use decimal inputs?

Yes. Decimal strength values are supported for lab, labeling, and mixology use cases.

fraction to proof (UK)

1 ABV Fraction = 174.978128 UK Proof · fixed factor via canonical reference constants · no offset

Direct Answer

1 ABV Fraction equals 174.978128 UK Proof

This conversion uses a fixed factor based on canonical reference constants.

For 0.25 ABV Fraction, the result equals 43.744532 UK Proof.

Converter Calculator

ABV Fraction (fraction)

1 ABV Fraction (fraction) =
174.978128 UK Proof (proof (UK))

Explanation

Multiply by 174.978127734 because 1 fraction corresponds to 100% ABV and 1 proof (UK) corresponds to 0.5715% ABV. ABV fraction is a 0 to 1 scale where 1 equals 100% ABV. 100 UK proof equals 57.15% ABV.

From ABV Fraction to UK Proof, the calculator applies one stable fixed-factor model derived from canonical reference constants.

Manual spot checks match the displayed values because calculator and table share the same conversion definitions.

Method & Reference (Verified)

Method basis: ABV Fraction to UK Proof uses the page-specific conversion model shown in Direct Answer.
Applied factor: 1 ABV Fraction = 174.978127734 UK Proof (as defined for this route).
Consistency rule: calculator output and table values use the same constants and rounding policy.

Common Conversion Values

ABV Fraction (fraction)	UK Proof (proof (UK))
0.25	43.744532
0.5	87.489064
1	174.978128
5	874.890639
12	2,099.737533
20	3,499.562555
40	6,999.125109
57.15	10,000
80	13,998.250219
100	17,497.812773